Hitch hiker nudi

[brighteye]

I first noticed this guy while my tank was cycling. He pops up about once a week for weeks now, always on the glass. Today I noticed that he is about 3 times bigger than he was a couple of weeks ago. He must be eating something. I now have a few small corals, I have not noticed any damage......but, I took him out & have him in a cup of tank water. He is all white with the nudi things down his back and a long hair - like thing sticking off his bum. Sorry for the crappy pic , he is very tiny. We took this pic through a magnifying glass. Is he a bad dude? He's really cool & I would not mind keeping him, but not at the expense of my corals.

 

[aninjaatemyshoe]

I am by no means an expert on the subject and the photos leave much to be desired in terms of clarity, but I think it looks like a berghia nudibranch. Do you happen to have any aiptasia on your live rock?

 

[rldavisou]

I would say berghia, as well. Excellent for aiptaisia control; won't last long without any anemones to eat.

 

[1337TANKHAX]

It also might be a zoa eating nudi, i had an outbreak in my tank a few weeks ago. :/ Just keep an eye on your zoas if you have any.

 

[brighteye]

Thanks for your replies, I put him back in the tank. He is now big enough to see ( easily removed if I need to) I do have a couple of small glass anemones that I can see, although it seems like there were more before? All my coral frags are very vibrant , open and visibly growing, so I don't think they have been on the menu. I have seen berghia on e bay for sale ( kinda expensive) how likely is it to get one for free on live rock? Anyways, he is certainly not starving with the growth I have seen. Hopefully he is eating the anemones, if so I won't purchase the peppermints I was going to get.
Again, thanks